Add tests for custom operator implementation correctness

[Kacper-Pietkun]

I added tests for custom ops defined in vllm_gaudi/ops:

• For the tests of ops that are not using cuda kernels - native ops and hpu ops are triggered for the same input and their outputs are compared
• For others tests that are using cuda kernels (so cannot be called with vllm-gaudi plugin) I created separate directory to store some predefined small tensors - weights, inputs and outputs. These tensors are too big to hardcode them in tests, however their sizes were adjusted, so all of them weight less than 3MB in total. Tensors are stored in a .safetensors format. Such tests run hpu ops with loaded inputs and weights and compare their outputs with the loaded outputs.

[Kacper-Pietkun]

/run-gaudi-tests

[Kacper-Pietkun]

/run-gaudi-tests

[github-actions]

✅ CI Passed

All checks passed successfully against the following vllm commit:
7e0941055fdf89bae93045683dd80542177f3241

[Kacper-Pietkun]

/run-gaudi-tests

[github-actions]

✅ CI Passed

All checks passed successfully against the following vllm commit:
63b22e0dbb901b75619aa4bca2dfa1d7a71f439e

[github-actions]

🚧 CI Blocked

The main CI workflow was not started for the following reason:

Your branch is behind the base branch. Please merge or rebase to get the latest changes.

[Kacper-Pietkun]

/run-gaudi-tests

[github-actions]

✅ CI Passed

All checks passed successfully against the following vllm commit:
b368382964913312d41c670b4166f4c83eed49aa